1.
# cd /usr/bin
# ln -s -f /usr/local/jdk1.6.0_01/jre/bin/java
# ln -s -f /usr/local/jdk1.6.0_01/bin/javac
2. Remove the old empty java environment
# rm -f /usr/bin/java
# rm -f /usr/bin/javac
# rm -f /etc/alternatives/java
# rm -f /etc/alternatives/javac）